Surface Finishing for Delrin (POM / Acetal)

Delrin surface finishing options are limited. The material is difficult to paint or bond. Most applications use the as-machined finish, which is already smooth and functional.

Recommended Machining Parameters

ParameterValue
Achievable Tolerances±0.02 mm (finished)
Surface FinishRa 0.4-1.6 μm
Cutting SpeedN/A
Feed RateN/A
Tooling RecommendationsN/A — post-machining process

Expert Machining Tips

1

As-machined finish is standard and usually sufficient

2

Bead blast for uniform matte look

3

Cannot be easily painted or glued

4

Consider colored Delrin stock for cosmetic needs

Common Parts Made

As-machined gears

Polished bearing surfaces

Bead-blasted covers

Machining Challenges

  • Cannot be painted or bonded
  • Very limited finishing options
  • Color only through stock material selection

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